Rise and Fall: Civilizations at War was a reasonably innovative game at the time, combining third person and RTS and it had a good soundtrack. But it fell into obscurity with its fairly mediocre actual gameplay. It's actually been made available for free at GamersHell.

To Zanarkandi think this is one of the best games ever made, at least to me. I was pretty young when I first played it, but the one thing that stuck in my head was the music! I spent quite a bit of time figuring it out on my piano. There's also a version with a whole symphony on youtube somewhere.

I also love pretty much anything from Ocarina of Time. Saria's song and the Gerudo Valley theme are my favorites!